Generator for alternating electric currents.



No. 857,394. PATENTED JUNE 18, 1907. W. HALLOGK. GENERATOR FOR ALTERNATING ELECTRIC CURRENTS.

APPLICATION FILED SEPT. 21, 1906.

3 SHEETS-SHEET 1.

Willi/Mm ATTORNEY No. 857,394. PATENTED JUNE 18, 1907. W. HALLOCK.

GENERATOR FOR ALTERNATING ELECTRIC CURRENTS.

APPLICATION FILED SEPT. 21, 1906.

3 SHEETS-SHEET 2.

AMNVENTOH I A TTOHNE Y No. 857,894. PATENTED JUNE 18, 1907. W. HALLOGK.

GENERATOR FOR ALTERNATING ELECTRIC GURRENTS.

APPLICATION FILED $21 121 1 906 3 SHEETS-SHEET a.

FIG. 8 FIG. 9

FIG. 11 FIG. 12 FIG. I 3

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A TTOHNEY UNITED STATES PATENT OFFICE.

GENERATOR FOR ALTERNATING ELECTRIC CURRENTS.

Specification of Letters Patent.

Patented June 18, 1907.

Application filed September 21, 1906. Serial N0- 336,541.

To all whom it may concern.-

Be it known that I, WILLIAM HALLOCK, of the city, county, and State of New York, have invented a new and useful Im rovement in Generators for Alternating E ectric Currents, of which the following is a full, clear, and exact description.

My invention relates to im rovements in electric generators and especia ly to that type of generator known as lnductor generators and which generate an alternating electric current.

The object of my invention is to produce a particularly simple and inexpensive arrangement of the interlocking and magnetic circuits whereby the magnetic circuit is not reversed in any part at any time, and the arrangement of coils is especially efficient. All to the end that a generator-may be built of cheap and simple construction and especial high efficiency.

To these ends my invention consists of an.

alternating electric generator, the construction'and o eration of which will be hereinafter clear y described and the novel features claimed.

Reference is to be had to the accompanying drawings forming a part of this'specification in which similar letters and figures of reference indicate corresponding parts in all views.

Figure 1 is a side elevation of the generator embodying my invention. Fig. 2 is an edge or front view of the same; Fig. 3 is a section on the line 33 of Fig. 1. Fig. 4 is a sectional elevation of a modified form of the invention. Fig. 5 is a front view partly in vertical longitudinal section of the construction shown in Fig. 4. Fig. 6 is an inside elevation of the structures shown in Figs. 4 and 5, and shows the arrangement of the coils and the polar projections. Fig. 7 is a detail elevation of the rotor. Fig. 8 is a detail crosssection or radial section through one of the long polar projections. Fig. 9 is a view similar to Fig. 8, but through one of the short polar pro ections. Fig. 10 is a sectional diagrammat1c develo ment of the generator especially shown in i s. 8 and 9. Fig. 11 is a vertical longitudina section of a modified form of the generator showing the outer pole ieces or projections. Fig. 12 is a view simil ar to Fig. 11, but showing the inner polar rojections; and Fig. 13 is a diagrammatic development of the structure as shown in Figs. 11 and 12.

The generator is provided with opposed large castings 10 which form practically a stator or field casting and these sections can be secured in any convenient way, but are preferably provided with meeting lugs 11 through which fastening bolts 12 can be passed. The casting is provided with a se ries of radially arranged polar projections 13 and 13 which are relatively long and short as shown clearly in Fig. 1 and the casting, including the pole pieces or projections can conveniently and effectively be cast iron, or the polar projections hereinafter described, may be laminated.

As shown in Figs. 1 to 3 the polar projections which are hollow and open in the inner sides as shown in Fig. 3, contain the field coil A which is arranged on the outer wall of the several pole pieces or projections 13 and 13 and the two portions B of the generating coil, these coils A and B having suitable terminals 'a and 6. Turning through the polar projections 13 and 13 are the magnetlc connecting pieces 14 which are preferably separated by a strip of non-magnetic material 15, and these connecting pieces 14 are preferably laminated. The connecting pieces and non-magnetic block 15 are carried on the ends of the spokes 16 of the rotor and these project regularl from the hub 17 which is carried by the shaft 18 and the latter can be driven in any usual way. In the several drawings the structure shown in Fig. 1, to 3 is especially adapted for a large sized generator and in the several views I have shown a single rotor, but it will, of course, be understood that this structure can be duplicated on a single shaft to any desired extent. The structure which I have arge sized generators and heretofore it has been found difficult to make generators of this type in large sizes.

In the structure described above, when the rotor is turned, the field coil A produces a magnetic flux, the ma etic circuit being around it through the old casting 10, the

olar projections 13 and 13 and the connectmg pieces 14 of the rotor. In a general way the lines of magnetic flux are similar to a string wound on and through an anchor ring, or, in other words, the lines would represent a sine curve and the flux always experiences the same reluctance. When the spokes 16 of the rotor are in a position such that they lie between the shorter polar projections 13, as shown in Fig. 9 then the magnetic flux is onjust described is, as stated, well adapted to tirely outside of the generating coil B. It

passes through the casting 10, the short polar the longer polar projections 13 as shown in. Fig. 8, then the magnetic flux is through the longer polar projections 13 and the inner .connecting pieces 14 on the spokes 16 of the rotor. this position all the magnetic flux threads through the generating coil B as well as through the field coil A. Thus While moving from the position shown in Fig. 9 to that shown in Fig. 8, all the magnetic flux is made to cut into the generating coil B thereb inducing an electric current therein Vilbile moving forward the rotor from the position shown in Fig. 8 to that on the next shorter projection 13, corresponding to a repetition of Fig. 9, all the magnetic flux is made to cut out of the generating coil B thereby inducing a current of electricit in a directon opposite to the one above re erred to. Thus as the rotor continually rotates, as many alternating electric currents are generated as there are polar projections, that is, twice as many as there are spokes upon the rotor; there will be as man complete cycles as there are spokes on tile rotor. Fig. 1 shows a generator with 16 spokes and 16 on and short polar projections and consequent y of 16. cycles per revolution, but it is evident that the same plan of construction and operation could as well be a plied to either a smalleror greater number oi cycles per revolution.

Referring to the other enerator, or modification, it be seen that the rotor turns between opposite castings and that the polar projections are sli htly different in the1r arrangement. In this case the coil A is arranged in the inner part of. the casting and the coil B upon the outer part and the outer and inner pole pieces or polar projections 19 and 20 are staggered in relation to each other as clearly shown in Fig. 6. The rotor as shown in 7 has spokes 16 with connecting pieces 21 turning opposite the pole pieces 19 and connecting pieces 21" turning opposite the ole piece 20. In this construction the two alves of the field coil A produce a magnetic flux through the hub of the rotor an the central ortlon of the machine 10 which is com eted around the outside through the polar projections and the connecting pieces on the spokes of the rotor. When the rotoris in the position indicated at Fig. 12 all the flux passes through the inner polar projections 20 and through the inner connectin pieces 21 of the rotor, thus being entirely inside of the. operator coil B, and when the rotor is move forward to the position indicated by Fig. 11, the flux is entirely through the outer polar projections 19 and the outer connecting ieces 21 on the spokes of the rotor. In t 's position the magnetic circuit includes the generating coil B. In the first position none of the ma netic flux threads the generating coil B and 1n the second position all the magnetic flux threads the said generating coil; hence in passing from one position to the other an electric current is induced in the said coil B. In passing to the next position, corresponding to Fig. 12, an electric current will be simi. larly generated in the opposite direction; here again there will be as many complete cycles per revolution of the rotor as there are spokes in the rotor and polar projections in each of the sets. In the machine indicated I have shown six, but evidently'a greater or less number could be employed.

The above description and drawings set forth clearly the prmci le and operation of the machine, but 1t wil be clearly seen that the minor details of construction, the design, form and materials can be considerably changed without affecting the principle of the invention. It will .be further seen that the invention is extremely sim le,'and my experiments have shown that t 's arrangement of the parts produces a generator of very high efficiency. Y

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent:

1. An alternating current enerator having concentrically arranged field and generating coils, a field with concentric sets of polar projections staggered radially with relation to each other, and a rotor traversing the field and having connectin piecesor projections turning opposite t field projections, wherebythe ma etic circuit alternately includes the fiel coil only and the field and generating coils.

2. An alternating electric generator havin stationary staggered pole ieces in the fie d, a rotor traversing the fiel and having connecting pieces turnlng opposite the polar pro'ections, and concentrically arranged .fiel and generating coils, each comprising a single coil, and the coils being placed on opposite sides of the inner polar projections.

3. An alternating current generator comprising a field having two sets of polar pro ections radially staggeredwith reference to each other, a single eld coil, a generating coil, and a'rotor without winding turning 0 posite the said polar projections, the sand rotor having concentrically arranged magnetic connecting pieces separated by nonmagnetic materlal.

4; An alternating current generator comprising a field having sets of concentrically arranged but radiall stag ered pole pieces, concentrically arranged field and enerating co ls, each comprising a single 00%, and the colls being arranged adjacent to the pole set of polar projections, and a rotor having spokes carrying connecting pieces to turn trically arranged magnetic connecting pieces opposite the said polar projections, whereby turning opposite the aforesaid polar projec- 1 at each revolution of the rotor there are as 15 tions. l many complete cycles per revolution as there pieces, and a rotor turning opposite the said polar projections, said rotor having concen- 5. An afilternating current generator, cornare spokes on the rotor. prising a eld having radially arran ed polar projections in tWo concentric setsfthe ro- WILLIAM HALLOOK' jections of each set being spaced apart, eld and generating coils arranged concentrically and on radially opposite sides of the inner Witnesses:

T. B. JoHNsoN, WARREN B. HUTcHINsoN. 

